Magnetic level gauges are widely used in various industries to measure and monitor the level of liquid in tanks and vessels. These gauges provide a reliable and accurate way to determine the liquid level without the need for direct contact with the liquid. Understanding how magnetic level gauges work and the different types available can help you choose the right gauge for your specific application.
How Does a Magnetic Level Gauge Work?
A magnetic level gauge consists of a float, a chamber, and a magnetic system. The float, typically made of a buoyant material, is designed to float on the surface of the liquid being measured. The chamber, which is in direct contact with the liquid, contains a series of magnets or magnetic strips. As the float moves up or down with the liquid level, the magnets or magnetic strips inside the chamber also move, creating a magnetic field.
Outside the chamber, there is an indicator strip or a series of individual magnetic flags that are magnetically coupled to the magnets or magnetic strips inside the chamber. When the float moves, the magnetic field created by the magnets or magnetic strips causes the indicator strip or flags to move as well. By observing the position of the indicator strip or flags, the liquid level can be accurately determined.
Advantages of Using a Magnetic Level Gauge
There are several advantages to using a magnetic level gauge over other types of level measurement devices. First and foremost, magnetic level gauges are highly reliable and accurate. Since they do not require direct contact with the liquid, there is no risk of contamination or corrosion. This makes them ideal for use in industries where maintaining the purity of the liquid is crucial, such as pharmaceutical or food production.
Another advantage of magnetic level gauges is their ability to withstand extreme temperatures and pressures. They are designed to operate in harsh environments, making them suitable for applications in industries like oil and gas, chemical, and power generation. Additionally, magnetic level gauges are easy to install and require minimal maintenance, reducing downtime and overall costs.
Magnetic Level Gauges Types And Differences
Magnetic float level gauges, magnetic flap level gauges, and magnetic column level gauges are all magnetic float level gauges, all of which work according to the principle of buoyancy and magnetic coupling. So, what are the differences between the magnetic flap level gauge, the magnetic column level gauge and the magnetic float level gauge?
The working principle of the magnetic flap liquid level and the magnetic flap liquid level gauge are the same, and the application scenarios are the same. Magnetic flap (column) level gauges are generally installed on the side of the tank container, and can also be installed on the top. They can be used for medium level detection in various towers, tanks, tanks, spherical containers and boilers. Therefore, the magnetic flip level gauge and the magnetic flip column level gauge actually refer to the same product, and the main difference is that the shape of the flip unit in the indicator panel of the two is different.
1. The flipping unit of the magnetic flap level gauge is in the shape of a rectangular block, similar to a flat plate type. A cylindrical magnetic steel is placed inside the flap, and the magnetic poles of the magnetic steel are on both sides of the flap, so it is called a magnetic flap. It is customary to call this The liquid level gauge is a magnetic flap level gauge. The material of this flap is usually aluminum alloy and plastic.
2. The flip unit of the magnetic flip column level gauge is cylindrical, and there is also a magnetic steel inside. Its magnetic poles are on the front and back half cylinders of the cylinder. Because its shape is cylindrical, it is called a magnetic flip column, which is also called a magnetic flip column. This type of liquid level gauge is a magnetic flip-column liquid level gauge. The material of this flip-up column is generally made of plastic. In order to be suitable for ultra-high temperature conditions, some manufacturers also use ceramics.
Difference between magnetic flap level gauge and magnetic float level gauge
Magnetic float level gauge is referred to as float level gauge, also known as plug-in level gauge. It has the advantages of simple structure, convenient use, stable performance, long service life, easy installation and maintenance, etc. It is widely used in petroleum processing, food processing, chemical industry, etc. , liquid level measurement, control and monitoring in the fields of water treatment, pharmaceutical, electric power, papermaking, metallurgy, ships and boilers. Compared with the magnetic flap level gauge, it has the following differences:
1. The installation location is slightly different.
Unlike the magnetic flap liquid level gauge, which can be installed on the side of the container or on the top of the container, the magnetic float level gauge is generally installed on the top of the container, and the meter head has a digital display of the on-site liquid level, and its working principle is similar to that of a dry reed. Tube level transmitter.
2. The working principle is different.
1) The working principle of the magnetic flap liquid level gauge is that when the liquid level in the measured container rises or falls, the magnetic float in the body tube of the liquid level gauge rises and falls under the action of buoyancy, and the permanent magnetic steel in the float rises and falls. It is transmitted to the magnetic indicator through the action of magnetic coupling, and drives the red and white flipping columns to flip 180°. When the liquid level rises, the flipping column changes from white to red. When the liquid level drops, the flipping column changes from red to white. The red and white junction of the level gauge indicator is the actual height of the liquid level inside the container, so as to achieve a clear indication of the liquid level. Under normal circumstances, the flip plate or flip column of the display is red and white.
2) The magnetic float of the magnetic float level gauge is usually hollow and passes through a guide rod in the middle. Its working principle is that when the float moves up and down along the guide rod with the change of the liquid level, the magnetic steel in the float is located. The position of , will change the closed state of the magnetic switch in the reed switch in the guide rod. Only the reed switch within the action range of the magnetic steel is closed, and the others are in the open state, thereby changing the resistance value of the circuit. The position of the float is equivalent to the sliding point of the potentiometer. As the position of the float changes, the resistance value changes, and the output voltage changes accordingly. Through current/voltage conversion, it is converted into a current signal output of 4-20mA, so as to realize the electrical signal output. Remote transmission and control, and can drive the LED liquid level display on the field meter. The resolution is usually ±5mm and ±10mm. The more reed switches are used, the higher the accuracy.
Applications of Magnetic Level Gauges
Magnetic level gauges can be used in a wide range of applications across various industries. Some common applications include measuring the liquid level in storage tanks, reactors, boilers, and distillation columns. They are also used in industries where the liquid being measured is corrosive, hazardous, or at extreme temperatures. Magnetic level gauges are particularly useful in industries such as oil and gas, chemical processing, pharmaceutical, and food and beverage.
Factors to Consider When Choosing a Magnetic Level Gauge for Tanks
When selecting a magnetic level gauge for tanks, there are several factors to consider to ensure the gauge meets your specific requirements. First, consider the type of liquid being measured and its compatibility with the materials used in the gauge. Some liquids may be corrosive or reactive, requiring a gauge made from a specific type of material such as stainless steel or PTFE.
Next, consider the operating conditions of the tank, including the temperature, pressure, and the presence of any hazardous substances. This will help determine the type of magnetic level gauge that can withstand these conditions without compromising accuracy or safety.
Finally, consider the installation and maintenance requirements of the gauge. Some gauges may require special mounting arrangements or additional accessories, while others may require regular calibration or inspection. Understanding these requirements will help ensure the gauge can be easily installed and maintained in your specific application.
Conclusion
Choosing the right magnetic level gauge is crucial for accurate and reliable liquid level measurement in tanks and vessels. Understanding how magnetic level gauges work, the advantages they offer, and the different types available can help you make an informed decision. Consider the specific requirements of your application, including the type of liquid, operating conditions, and installation and maintenance needs, to select a magnetic level gauge that meets your needs. By choosing the right gauge, you can ensure accurate and safe liquid level monitoring in your industry.
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